Sadly, this stopped working about a month ago. Using the latest Firefox available for Debian based Linux distro "MX Linux 19.4"

Normally, I love this addon, but right now it literally does nothing. It doesn't even highlight sponsored spots within the videos.

PS: Despite being a Linux user, I am not an IT expert, a programmer etc etc. I'm just an average Joe who hates Windows & Mac, so.... There's that. :/